Improvement in coating metallic surfaces



UNITED STATES PATENT OFFICE.

WM. BUTCHER AND W. A. BUTCHER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT lN COATING METALLIC SURFACES.

Specification forming part of Letters Patent No. 20,697, dated June 29, 1858.

To all whom it may concern:

Be it known that we, WILLIAM BUTCHER and WILLIAM A. BUTCHER, both of the city and county of Philadelphia, and State of Pennsylvania, have invented a new and useful process for coating-metallic surfaces with a composition to protect such surfaces from rust or decay when exposed to the action of water, vapor, or the atmosphere; and we do hereby declare that the following is a full and exact description of the same.

We take one gallon of linseed-oil and put into it from eight to twelve pounds of crude india-rubber, the quantity being thus varied as the coating is required to be of greater or less consistency, and boil the oil in a suitable vessel until the rubber is entirely dissolved in and thoroughly mixed with it. \Ve then take the piece of metal, having first heated it in an oven or other arrangement for the purpose to a temperature of about 350, and insert it in the prepared mixture of oil and rubber and let it remain until it is coated with the preparation to the thickness required. It is then taken out of the preparation and placed in a heatingoven heated to a temperature of about 200, and baked therein until its coating is properly hardened, and after it is taken from the oven and cooled sufficiently to be handled it is ready to be put to the use and purpose for which it was intended. The metal requires no previous preparation to receive the coating, except being heated, as above described. The same process is employed for all descriptions of metal which may require to be coated with the preparation. It may also be employed for coating with the preparation various articles of metal after they are manufacturedsuch as water, gas, and drain pipes, sinks, wash-boilers, and many others-which are exposed to the action of water, and which are subject to decay from rust, or which may be exposed to the action of the weather-such as metallic roofingplates, iron railings, iron buildings, or iron columns, and ornaments for brick or other buildlogs.

The coating, when properly applied, as herein described, to metallic surfaces that are only exposed to the action of vapor or of the atmosphere and are not subjected to frictional wear or handling, will remain perfect for a great length of time, and it is indeed questionable whether it would ever require renewal, so that it is peculiarly applicable to exposed metal work (such as before named) that now requires to be frequently painted to cover the efi'ects of the oxidation of the metal of which they are composed, and its application to them also serves to make them much more durable than when they are protected by any of the means at present in use for that purpose.

We do not claim the coating herein described, nor the application of a coating or varnish which is impervious to air, vapor, or water to the surface of metals to prevent the oxidation of said metals.

What we claim as our invention, and desire to secure by Letters Patent, is-- The process of coating metallic surfaces herein described,consisting, first, of heating the metal to be coated to about 350 of heat; second, inserting the metal while so heated into a bath or reservoir containing the mixture.prepared as described; and, third, in placing the metal so coated in a baking-oven heated to about 200 of heat to harden the coating, all

as herein set forth.

WM. BUTCHER. WM. A. BUTCHER. Witnesses:

FRANCIS S. Low, SIDNEY Low. 

